滑塌浊积扇内幕结构及成因——以涠西南凹陷流一段上亚段为例  

Internal structures and genetic mechanism of slump turbidite fans:an example of the E_2l_1 in Weixinan Sag

作　　者：陶倩倩 周家雄 孙文钊 陈丽君 李达 TAO Qianqian;ZHOU Jiaxiong;SUN Wenzhao;CHEN Lijun;LI Da(Research Institute, Zhanjiang Branch, CNOOC,Zhanjiang, Guangdong 524057, China)

机构地区：[1]中海石油(中国)有限公司湛江分公司研究院,广东湛江524057

出　　处：《石油地球物理勘探》2019年第2期423-432,I0010,共11页Oil Geophysical Prospecting

基　　金：国家科技重大专项"南海西部海域低渗油藏勘探开发关键技术"(2016ZX05024-006)资助

摘　　要：涠西南凹陷流一段上亚段发育大规模滑塌浊积扇,是油气勘探的有利目标。为了揭示滑塌浊积扇结构及成因,综合运用地震相、岩心、地层切片、相控稀疏脉冲反演、模型正演等多种地质及地球物理手段,对涠西南凹陷流一段上亚段发育的滑塌浊积扇的内幕结构、主控因素、沉积模式等进行分析。研究结果表明,涠西南凹陷流一段上亚段发育的滑塌浊积扇体,具有由多个"V"形或"U"形下切水道组成的波状、短波状地震反射结构,呈点状、条带状展布特征。岩性组合为向上变细的正韵律沉积序列,岩心可见变形层理、包卷层理及重荷模等滑塌浊积沉积构造。浊积扇内幕结构由纵向上厚度不同、横向展布范围大小不一、接触样式多变的多期浊积砂体堆积而成,浊积扇形成受控于半深湖相滞水环境、自身重力及2号断裂带构造坡折带。该成果可为涠西南凹陷及其他盆地三角洲前缘滑塌浊积扇研究提供参考。Large-scale slump turbidite fans were developed in the upper E2l1 of Weixinan Sag,which are favorable targets for the hydrocarbon exploration.A variety of geological and geophysical means such as sedimentary sequence,stratal slice,facies-constrained reservoir prediction,and forward modeling are used to research their internal structures,key controlling factors,and the sedimentary model.The results show that the slump turbidite fan of the upper E2l1 in Weixinan Sag has a few incised channels.They show V-or U-shaped wave or short wave with a spot and strip distribution on seismic profile.The lithologic assemblage is characterized by fining-upward sedimentary sequence.The cores have turbidite structures such as deformation bedding,coiling bedding,and impression.Internal structures of turbidite fan in this area are composed of sand bodies with different thickness,different lateral distribution,and variable contact styles.The internal structures and genesis of the turbidite fans were controlled by middledeep lake facies,its own gravity,and structural slopebreak zone of Fault Zone No.2.This study provides references of the slump turbidite fan study for Weixinan Sag and other basins.

关 键 词：涠西南凹陷 滑塌浊积扇 地层切片 模型正演 相控稀疏脉冲反演 内幕结构 

分 类 号：P631[天文地球—地质矿产勘探]